import { describe, expect, it, vi } from 'vitest';

const listKitchenChangesMock = vi.fn();
const getStockEntryMock = vi.fn();
const fetchLocationsMock = vi.fn();

vi.mock('../../../src/api/stock.js', () => ({
  listKitchenChanges: (...args) => listKitchenChangesMock(...args),
  getStockEntry: (...args) => getStockEntryMock(...args),
}));

vi.mock('../../../src/api/locations.js', () => ({
  fetchLocations: (...args) => fetchLocationsMock(...args),
}));

const { dashboardPageData, renderDashboardPage } = await import('../../../src/features/dashboard/dashboard-page.js');

describe('features/dashboard/dashboard-page', () => {
  it('renders dashboard with recent changes section', () => {
    const html = renderDashboardPage();
    expect(html).toContain('Recent changes');
    expect(html).toContain('x-data="dashboardPage()"');
    expect(html).toContain('Saved means the backend created or updated a record.');
  });

  it('loads recent changes on init and renders item-focused state lines', async () => {
    listKitchenChangesMock.mockResolvedValueOnce({
      since: null,
      nextCursor: null,
      changes: [{
        type: 'item',
        action: 'upsert',
        timestamp: '2026-04-10T10:00:00Z',
        item: {
          uuid_b64: 'u1',
          name: 'Rice',
          stock_type: 'measured',
          quantity: 3,
          uom_symbol: 'kg',
          level: 'good',
          expire_date: '2026-04-21',
          location_initial_uuid_b64: 'loc1',
        },
      }],
    });
    fetchLocationsMock.mockResolvedValueOnce({
      flat: [{ uuid_b64: 'loc1', pathLabel: 'Pantry / Shelf A' }],
    });

    const store = {
      isConnected: true,
      setActiveKitchen: vi.fn(),
      addAlert: vi.fn(),
    };
    const data = dashboardPageData(store);

    await data.init();

    expect(listKitchenChangesMock).toHaveBeenCalledWith(store, { limit: 10 });
    expect(data.recentChanges).toHaveLength(1);
    expect(data.changesState.error).toBe('');
    expect(data.changeHeadline(data.recentChanges[0])).toBe('Item saved: Rice');
    expect(data.changeStateLine(data.recentChanges[0])).toContain('Quantity: 3 kg');
    expect(data.changeStateLine(data.recentChanges[0])).toContain('Location: Pantry / Shelf A');
    expect(getStockEntryMock).not.toHaveBeenCalled();
  });

  it('resolves stock event item context via item lookup when needed', async () => {
    listKitchenChangesMock.mockResolvedValueOnce({
      since: null,
      nextCursor: null,
      changes: [{
        type: 'stock',
        action: 'upsert',
        timestamp: '2026-04-10T10:00:00Z',
        stock: {
          item_uuid_b64: 'item-uuid-1',
          quantity: 0.5,
          uom_symbol: 'kg',
          level: 'some',
          location_uuid_b64: 'loc2',
        },
      }],
    });
    getStockEntryMock.mockResolvedValueOnce({
      uuid_b64: 'item-uuid-1',
      name: 'Flour',
      stock_type: 'measured',
      expire_date: '2026-05-02',
    });
    fetchLocationsMock.mockResolvedValueOnce({
      flat: [{ uuid_b64: 'loc2', pathLabel: 'Pantry / Bin 2' }],
    });

    const data = dashboardPageData({
      isConnected: true,
      setActiveKitchen: vi.fn(),
      addAlert: vi.fn(),
    });

    await data.refreshChanges();

    expect(data.changeHeadline(data.recentChanges[0])).toBe('Stock saved: Flour');
    expect(data.changeStateLine(data.recentChanges[0])).toContain('Quantity: 0.5 kg');
    expect(data.changeStateLine(data.recentChanges[0])).toContain('Level: Some');
    expect(data.changeStateLine(data.recentChanges[0])).toContain('Location: Pantry / Bin 2');
    expect(getStockEntryMock).toHaveBeenCalledWith(expect.anything(), 'item-uuid-1');
  });

  it('keeps empty state when API returns no changes', async () => {
    listKitchenChangesMock.mockResolvedValueOnce({
      since: null,
      nextCursor: null,
      changes: [],
    });
    fetchLocationsMock.mockResolvedValueOnce({ flat: [] });

    const data = dashboardPageData({
      isConnected: true,
      setActiveKitchen: vi.fn(),
      addAlert: vi.fn(),
    });

    await data.refreshChanges();

    expect(data.recentChanges).toEqual([]);
    expect(data.changesState.error).toBe('');
  });

  it('captures refresh errors in async state', async () => {
    listKitchenChangesMock.mockRejectedValueOnce(new Error('Feed unavailable'));
    const data = dashboardPageData({
      isConnected: true,
      setActiveKitchen: vi.fn(),
      addAlert: vi.fn(),
    });

    await data.refreshChanges();

    expect(data.changesState.error).toBe('Feed unavailable');
    expect(data.recentChanges).toEqual([]);
  });
});